package com.leo.apptest.widget;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

import com.leo.apptest.R;

import java.util.ArrayList;
import java.util.List;

public class TagLayout extends ViewGroup {
    private int mMaxLine = 2;
    private static final int LEFT = -1;
    private static final int CENTER = 0;
    private static final int RIGHT = 1;

    protected List<List<View>> mAllViews = new ArrayList<List<View>>();
    protected List<Integer> mLineHeight = new ArrayList<Integer>();
    protected List<Integer> mLineWidth = new ArrayList<Integer>();
    private int mGravity;
    private List<View> lineViews = new ArrayList<>();
    private View mView;
    private Context mContext;

    public TagLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        mContext = context;
        TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.TagFlowLayout);
        mGravity = ta.getInt(R.styleable.TagFlowLayout_gravity, LEFT);
        ta.recycle();
    }

    public TagLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public TagLayout(Context context) {
        this(context, null);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
        int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
        int cCount = getChildCount();
        for (int i = 0; i < cCount; i++) {
            View child = getChildAt(i);
            if (i == cCount - 1) {
                mView = getChildAt(i);
            }
            measureChild(child, widthMeasureSpec, heightMeasureSpec);
        }
        setMeasuredDimension(sizeWidth, sizeHeight);
    }


    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        mAllViews.clear();
        mLineHeight.clear();
        mLineWidth.clear();
        lineViews.clear();

        int width = getWidth();

        int lineWidth = 0;
        int lineHeight = 0;

        int cCount = getChildCount();

        int lineSize = 0;
        for (int i = 0; i < cCount; i++) {
            View child = getChildAt(i);
            if (child.getVisibility() == View.GONE) continue;
            MarginLayoutParams lp = (MarginLayoutParams) child
                    .getLayoutParams();

            int childWidth = child.getMeasuredWidth();
            int childHeight = child.getMeasuredHeight();

            if (childWidth + lineWidth + lp.leftMargin + lp.rightMargin > width - getPaddingLeft() - getPaddingRight()) {
                lineSize++;
                if (lineSize >= mMaxLine) {
                    if (lineViews.contains(mView)) {
                        lineViews.remove(mView);
                        lineViews.add(mView);
                    }
                    break;
                }
                mLineHeight.add(lineHeight);
                mAllViews.add(lineViews);
                mLineWidth.add(lineWidth);

                lineWidth = 0;
                lineHeight = childHeight + lp.topMargin + lp.bottomMargin;
                lineViews = new ArrayList<>();
            }
            lineWidth += childWidth + lp.leftMargin + lp.rightMargin;
            lineHeight = Math.max(lineHeight, childHeight + lp.topMargin
                    + lp.bottomMargin);

            if (lineSize == mMaxLine - 1 && !lineViews.contains(mView)) {
                lineViews.add(mView);
                MarginLayoutParams lp2 = (MarginLayoutParams) mView
                        .getLayoutParams();
                int childWidth2 = mView.getMeasuredWidth();
                int childHeight2 = mView.getMeasuredHeight();
                lineHeight = Math.max(lineHeight, childHeight2);
                lineWidth += childWidth2 + lp2.leftMargin + lp.rightMargin;
            }
            lineViews.add(child);
            if (lineSize == mMaxLine - 1 && i == cCount - 1) {
                lineViews.remove(mView);
            }
        }
        mLineHeight.add(lineHeight);
        mLineWidth.add(lineWidth);
        mAllViews.add(lineViews);


        int left = getPaddingLeft();
        int top = getPaddingTop();

        int lineNum = mAllViews.size();

        for (int i = 0; i < lineNum; i++) {
            lineViews = mAllViews.get(i);
            lineHeight = mLineHeight.get(i);

            // set gravity
            int currentLineWidth = this.mLineWidth.get(i);
            switch (this.mGravity) {
                case LEFT:
                    left = getPaddingLeft();
                    break;
                case CENTER:
                    left = (width - currentLineWidth) / 2 + getPaddingLeft();
                    break;
                case RIGHT:
                    left = width - currentLineWidth + getPaddingLeft();
                    break;
            }

            for (int j = 0; j < lineViews.size(); j++) {
                View child = lineViews.get(j);
                if (child.getVisibility() == View.GONE) {
                    continue;
                }

                MarginLayoutParams lp = (MarginLayoutParams) child
                        .getLayoutParams();

                int lc = left + lp.leftMargin;
                int tc = top + lp.topMargin;
                int rc = lc + child.getMeasuredWidth();
                int bc = tc + child.getMeasuredHeight();

                child.layout(lc, tc, rc, bc);

                left += child.getMeasuredWidth() + lp.leftMargin
                        + lp.rightMargin;
            }
            top += lineHeight;
        }

    }

    @Override
    public LayoutParams generateLayoutParams(AttributeSet attrs) {
        return new MarginLayoutParams(getContext(), attrs);
    }

    @Override
    protected LayoutParams generateDefaultLayoutParams() {
        return new MarginLayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    }

    @Override
    protected LayoutParams generateLayoutParams(LayoutParams p) {
        return new MarginLayoutParams(p);
    }
}
